Anyone can say they’re a good plumber. A case study proves it. Five job types that turn a finished job into the sales tool that wins your next quote, plus the four-part format that makes it work.
Quotes to write, jobs to finish, reviews to chase… and somewhere in there, a website that still just lists your services instead of proving you can do the work. A case study fixes that with material you already generate on every job. AI-powered, human-led.
There are around 45,700 plumbing and heating businesses in the UK as of 2025 (Office for National Statistics). That’s a lot of competition when a homeowner or property manager types “plumber near me.” The ones who stand out aren’t always the cheapest or the most experienced… they’re the ones who can prove what they’ve done. That’s what a case study does.
Why case studies work harder than any ad
There’s a difference, and customers feel it.
97% of consumers read online reviews before choosing a local trade (BrightLocal Local Consumer Review Survey 2026). A case study is a review you control… one that shows the full story of the job, not just a star rating. It answers what a review can’t: what was the problem, how did you approach it, what did the finished job actually look like?
That matters more the bigger the job gets. A landlord weighing up a boiler replacement costing £2,000–£4,000 (MyBuilder) or a homeowner spending £3,250 or more on bathroom plumbing (Checkatrade) isn’t going to commit on a listing alone. They want evidence. That’s your case study’s job.
What a strong plumbing case study looks like
The format that works is simple. Four elements, in order.
The problem. What was the situation before you arrived? Be specific. “Recurring hot water loss in a 1970s semi-detached due to corroded copper pipework” says a lot more than “old pipes.” Specificity signals expertise.
Your approach. What did you do, and why? Include the materials used, the timeline, and any complications you navigated. This is where you differentiate yourself from the plumber who would have just patched it.
The result. What did the customer get? Quantify where you can… restored water pressure, a compliant install, days of disruption avoided. Keep numbers real and accurate.
The evidence. Before-and-after photos. A genuine customer quote, with permission. A Gas Safe certificate number if it’s relevant to the job. This is the proof layer that makes everything above credible.
5 job types that make the strongest plumbing case studies
Not every job is worth writing up. These five tend to produce the most compelling case studies because the before-and-after contrast is clearest.
| Job type | Why it makes a strong case study | Typical job value (UK, 2025) |
|---|---|---|
| Boiler replacement | Clear problem, clear solution, compliance angle (Gas Safe) | £2,000–£4,000 supply and fit (MyBuilder) |
| Full bathroom plumbing | Dramatic visual transformation, high customer satisfaction | £3,250 labour only (Checkatrade) |
| Leak detection and repair | Shows diagnostic skill, saves the customer a major bill | £100–£500 depending on complexity |
| Landlord compliance work | Demonstrates Gas Safe credentials, appeals to property managers | £60–£150 for a gas safety check (Gas Safe Register) |
| Emergency callout | Response speed is the story; reliability under pressure | £110 average call-out fee (Checkatrade) |
The jobs worth writing up aren’t always your biggest… they’re the ones with the sharpest contrast between problem and fix, or the ones that show a skill most of your competitors can’t match.
Where to use your case studies
A case study has more than one life. Once it’s written up, it works in several places at once.
Your website. A dedicated case studies or project gallery page gives visitors a reason to stay longer and enquire. It also gives Google something to index beyond your service list… real, specific content about real jobs.
Your Google Business Profile. The photo and post tools on GBP are underused by most tradespeople. A before-and-after post with a short description of the job, tied to a local area, builds your profile’s content and relevance at the same time. This is one of the core activities in our marketing support for plumbers… helping you show up when local jobs are being searched.
Proposals and quotes. When you send a quote for a larger job, attach the most relevant case study. It pre-answers “have you done something like this before?” without you having to say it.
Social media. Before-and-after content consistently outperforms any other format for trade businesses on Facebook and Instagram. The visual contrast does the work. You don’t need a caption longer than three lines.
Your on-the-job checklist: capture it without slowing down
The main reason most plumbers don’t have case studies isn’t a shortage of good jobs… it’s that capturing the material feels like extra work at the end of a long day. Here’s how to make it automatic rather than optional.
- Take three photos on every job: the problem as you found it, the work in progress, and the finished result. On a boiler replacement, that’s the old unit, the install in progress, and the clean finish with the paperwork.
- Jot two or three notes in your phone while the job’s fresh: what the problem was, what you did, and what the customer said when they saw it. A few lines is enough to write from later.
- Ask the customer before you leave. “Would it be alright if I used some photos of this job on my website?” Most people happy with the work will say yes. If they’d rather stay anonymous, you can still use the photos and describe the job without naming them.
That’s the exact routine we build into our Done For You plans for plumbers… we take the photos and notes you capture on the job and turn them into the write-up, the Google Business post and the social version, so the case study gets made even on the weeks you don’t have twenty minutes to write it yourself.
The Gas Safe angle: a trust signal only qualified plumbers can use
There are currently 150,729 engineers registered with Gas Safe as of March 2024 (Gas Safe Register At a Glance 2023/24). If you’re Gas Safe registered and your case study involves gas work, that registration is a trust signal your unqualified competition can’t replicate. Make it visible. Include your Gas Safe number. Reference the certification in the case study copy.
Gas Safe’s own inspection data shows that 1 in 5 UK homes has an unsafe gas appliance. That context makes a clear, competent boiler installation case study genuinely reassuring to a homeowner aware of that risk… and many are.
Why showing your work is a local search advantage
Google ranks local businesses partly on what it knows about you: photos, activity, reviews, and the specificity of your content. A plumber with a project gallery of real UK jobs, tagged to real postcodes, gives Google something to work with. One with a blank website and no reviews gives it nothing.
In dense markets, the difference between the local pack and page two often comes down to how much genuine, specific content you’ve put out. Case studies create that content as a natural by-product of doing the work. That’s the pattern we build on in our plumber marketing at ContentWorks… turning completed jobs into the visibility that fills the diary with calls and enquiries.
Frequently asked questions
What should a plumbing case study include?
A plumbing case study should cover the problem, your approach, the result, and evidence (before/after photos, a customer quote, or compliance certificate).
Keep it specific. A case study that says “replaced old boiler with new combi in a Victorian terrace, restoring hot water within four hours” tells a prospective customer far more than a general statement about your service quality. The specificity is what makes it credible.
Do I need customer permission to publish a case study?
Yes, if you’re naming the customer or using photos of their property. Ask before you leave the job, and keep it brief and easy to say yes to.
If they’d prefer to stay anonymous, you can still publish the case study without their name or identifying details. The job type, the problem, the fix, and the photos are usually enough. Many plumbers describe jobs by area or property type (“a 1930s semi in Sheffield”) rather than naming the homeowner, and it works fine.
How long should a plumbing case study be?
For a website page, 200–400 words is enough. For a social post, two or three sentences and two photos will outperform a long caption.
The goal isn’t an essay… it’s answering the reader’s question: “Can this plumber handle my job?” Clear photos and a focused write-up answer that faster than length does. Past 500 words, cut the least specific bits first.
Will a case study help me rank on Google?
It can, if it includes specific job types, locations, and real detail that Google can index. Generic content doesn’t help much; specific content does.
A case study for “emergency boiler repair in Leeds” gives Google something concrete to associate with your business and that area. Over time, a library of real project write-ups, each tied to a job type and location, builds the kind of local relevance that keeps your name in the local pack results.
What’s the difference between a case study and a review?
Both matter… reviews build trust, case studies show competence.
The strongest plumbing businesses use both. A case study tells the story of the job with your expertise front and centre. A review attached to it, or linked from it, adds the independent confirmation. Together they answer the two questions every prospect is asking: “Can they do the job?” and “Can I trust them?”
How many case studies does a plumber’s website need?
Start with three to five, covering your most common and your highest-value job types. Quality beats quantity.
Three well-written case studies with real photos and genuine detail will outperform a gallery of ten thin write-ups. Once three solid ones are live, add new ones as the jobs come in. The library builds naturally over a season or two without becoming a burden.
Can I use case studies to attract commercial property clients?
Yes, and this is where they pay off fastest. Property managers want to see compliance, reliability, and scale before they’ll call.
A case study from a multi-unit property, showing your Gas Safe compliance, a clear timeline, and minimal disruption to tenants, directly answers what a facilities manager or landlord is looking for. It’s far more persuasive than a brochure because it’s real. One well-written commercial case study can be worth more than a year of generic social posts.
Dan Jaques founded ContentWorks in Bournemouth. We’re the marketing department your trades business never had. We run all your marketing, so you can get on with the job.
Dan didn’t come to trades from marketing… he came to marketing from trades. His granddad was a carpenter, his uncles fitted kitchens and plumbed bathrooms, and he was on the tools himself at 16: carpentry, roof trusses, building sites, and furniture built on the side and sold at weekend markets. The marketing came later, and not in a straight line: market stalls, five clothing shops, early e-commerce, then SEO worked out by doing it and breaking it. He has run local marketing since 2014, originally as Dan Jaques Online Marketing, and ContentWorks followed in 2023.
Long gone are the days of just hiring an SEO. We run your marketing, from the first search to the next job. AI-powered, human-led.